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That depends on your objectives - if to just cover the bottom, very little, maybe an inch at most. For plants, at least two inches and somewhat deeper in the back to give a slope effect; and to create a bio-processing very low oxygen nitrate absorber, three to four inches deep. These values all assume sand; gravel would be at least 50% greater for each case.

If you just mean bag weight to achieve some arbritary but useful depth, well, for a 26 gal tank, I'd guess between sixteen to twenty-five pounds.

Knowledge is fun(damental)

A 75 gal with eight Discus, fake plants, and a lot of wood also with sand substrate. Clean up crew is down to just two Sterba's Corys. Filters: continuous new water flow; canister w/UV, in-tank algae scrubber!! Finally, junked the nitrate removal unit from hell.

I have about 1.5 inches in my tank with a moderate amount of plants which seam to work very well. If you don't want/plan on any plants, then I would suggest 3/4 to 1 inch to make routine maintenance a little easier

If you take your time to do the research FIRST, you can successfully set-up and keep ANY type of aquarium with ease."Not using a quarantine tank is like playing Russian roulette. Nobody wins the game, some people just get to play longer than others." - Anthony CalfoFishless CycleCycling with FishMarine Aquarium Info [URL="http://saltwater.aquaticcommunity.com/"]